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Y-Axis Idler Support Bracket for Thing-O-Matic

by CampbellsBot, published

Y-Axis Idler Support Bracket for Thing-O-Matic by CampbellsBot Oct 14, 2011

Description

I liked tomlombardi's Y-Axis support bracket a lot. Printed it out and it worked as advertised. Only I had another unrelated problem where the wires from my ABP would rub and catch on the same bolts used to attach this thing. I decided to modify this part to avoid any future issue with the wires rubbing too much or potentially stripping.

So I upgraded this part by fully recessing the nuts by making the part a little thicker. The holes are also large enough to not need any drilling, and you can also use the same bolts that were originally used - longer bolts are not needed. I also created a large radius on the right side to allow the problematic wires to freely slide over this area without catching.

Recent Comments

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Welcome to the 3D printing community! Removing raft can be a time consuming and sometimes even a part-damaging process, that's why a lot of people print without rafts - if the 3D model allows it. Sometimes the raft is necessary to get a good grip and level base on the platform before printing. An X-Acto blade or similar device is typically the tool of choice to remove raft after trying to manually peel as much off as you can. You can also use a sander or a block of wood with sandpaper glued to it.

For a part this small/short, there's little need for the raft. If you have one of the TOM's with the Automated Build Platform, you may need raft for taller prints, as the flex in the plastic belt can cause the part to tip or run into the extruder head. The ABP belt can also resort in uneven prints
due to the belt bend/flex and wrinkles.

If you do have the ABP, I would suggest scrapping it and get the Aluminum build platform and some wide Kapton tape. MUCH more reliable and parts stick to the platform very well.

Good luck!

I just printed this item and excited about installing my first 'mod' onto my TOM. I am brand new to printing on my TOM - 3 days now - so this may be a newbie thing...am I the only person who can not get the raft off of the bottom of my prints? Or, does every else print without rafts? I looked at almost off the "I made one" pics of this item and no one else has raft parts. I can't pull the stuff off. Anyone offer any insight?

Thanks,
Randy

Yes, beauturner, a good option. I intend to try the slurry technique for several purposes once I install some positive ventilation, and possibly a fume extraction hood, in my TOM's new home.

Until then I'm using no solvents and printing only with the door open :-P

There is some slight benefit to loosely-held-captive nuts when trying to thread into them, though - no critical alignment needed.

Always there are tradeoffs!

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Instructions

1. Print Part

2. Unscrew and remove top two bolts from front right rod cover

3. Place bracket over Y-Axis idler bolt head and align with rod cover bolt holes.

4. Hold nuts in recessed areas and screw bolts on tightly.

Comments

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randythawkins on Jun 6, 2012 said:

I just printed this item and excited about installing my first 'mod' onto my TOM. I am brand new to printing on my TOM - 3 days now - so this may be a newbie thing...am I the only person who can not get the raft off of the bottom of my prints? Or, does every else print without rafts? I looked at almost off the "I made one" pics of this item and no one else has raft parts. I can't pull the stuff off. Anyone offer any insight?

Thanks,
Randy

CampbellsBot on Jun 6, 2012 said:

Welcome to the 3D printing community! Removing raft can be a time consuming and sometimes even a part-damaging process, that's why a lot of people print without rafts - if the 3D model allows it. Sometimes the raft is necessary to get a good grip and level base on the platform before printing. An X-Acto blade or similar device is typically the tool of choice to remove raft after trying to manually peel as much off as you can. You can also use a sander or a block of wood with sandpaper glued to it.

For a part this small/short, there's little need for the raft. If you have one of the TOM's with the Automated Build Platform, you may need raft for taller prints, as the flex in the plastic belt can cause the part to tip or run into the extruder head. The ABP belt can also resort in uneven prints
due to the belt bend/flex and wrinkles.

If you do have the ABP, I would suggest scrapping it and get the Aluminum build platform and some wide Kapton tape. MUCH more reliable and parts stick to the platform very well.

Good luck!

BallardHill on Jan 2, 2012 said:

Excellent upgrade component!

I didn't like the single-ended support of an idler when belt tension is so critical to good performance, especially as we explore higher feed rates.

Was glad to stumble across this (at: http://prometheusfusionperfect....

I added a post-processing
step, since I've become weary of dropping screws, nuts, and washers and being forced to my knees to retrieve them;

1) After the print was finished and cleaned up a tiny bit (cosmetics only - all dimensions and aperatures were spot-on);

2) Inserted the nuts and secured in place with screws;

3) Ad
ded a #4 washer on each screw over the nut;

4) Dialed the temperature down on my soldering iron and used a length of filament to plastic-weld the washers in place.

Would be a nice addition to the component to add retainer plastic hubs around the nut recesses, pausing the print at the appropriate
place to allow insertion of nuts into their homes.

Currently this would probably require a manual edit to the gcode between the correct layers, and I have no idea if ReplicatorG will allow a restart after a gcode pause.

Would the same layer need a caress with the hot nozzle and no filament feed to
get good adhesion of the next layer after restart?

During initial assembly of my TOM I had added a length of miniature piano hinge between the inside of the back panel and the underside of the electronics pallet - made retrofitting washers on the Idler bolt easy before installing the Idler Support
Bracket.

Thanks, CambellsBot and tomlombardi!

beauturner on Jan 4, 2012 said:

BallardHill you might find rather than a pause or use of the soldering iron to change this step to mixing up some glue (assuming you are using ABS). This technique I have been using the last couple weeks and it works amazingly well: http://www.thingiverse.com/thi...

:)

kfp on Dec 1, 2011 said:

Printed nicely (MK7 with 0.3 layer and 20mm speed). The nuts fit perfectly, I did however need a little Dremel action to fit the M4 head into the opening.

Perfect addition! I was noticing the belt pulling the M4 inwards causing the idler to slide up too far and this will take care of that!

MeHoo on Nov 1, 2011 said:

Printed it tonight. 69mm/sec @ .15mm layer height. Everything was cruising along perfectly (even got a nifty macro video of it up on my vimeo because the speed was so cool to watch), but then it hit the top of the nut opening and had to bridge and just caught a clump. It's still usable though. Definitely not needing to be printed at .15 but it was my test object for this profile.

All in all thanks for the part. This was one of the first mods I was going to make after building my bot. Actual first being heatsinks and a 70mm fan on the side blowing over the extruder board ;)

Thanks again and let me know if you like the video I took: http://vimeo.com/31417618

It should co
nvert within the hour.

sockles on Nov 13, 2011 said:

Wow thats fast! Are you using 3mm filament?

CampbellsBot on Nov 1, 2011 said:

Wow that's some impressive speed and layer thickness you got going on there. I based my print on standard settings so everyone who printed it should come out with the same result. Nice video! Thanks for the credit too 8-)

jman on Oct 18, 2011 said:

V4 was fine! Thanks for this.

slightlynybbled on Oct 16, 2011 said:

Love it!

I'm not changing anything on my setup, but I did note that the nuts did have a bit of room to rotate. I ended up rotating one of them around further than I would have liked. This may have been me over-tightening.

The geometry of the part from the screws, rod, and idler was perfect.

Thanks agai
n

CampbellsBot on Oct 17, 2011 said:

Thanks! You can see in my picture the bolts did get overtightened as well. I may decrease the size of those by a hair and re-upload.

RotoScan on Oct 15, 2011 said:

Well done! It fits perfectly.

eried on Oct 15, 2011 said:

Do you think this is necessary?

I printed the original piece but looking the y-axis idler from very near, there is no vibration, I don't think the force over the acrilic is so strong.

CampbellsBot on Oct 17, 2011 said:

It may not be necessary, but another benefit is because I've had to really tighten my Y-axis belt to avoid getting wobbly circles, so there's a lot of stress on that Y Idler. So it gives me a little reassurance that the bolt doesn't get bent or the Y-axis belt loosens. The Y-axis belt even gets tightened a tad more when this item is screwed on the ToM

RotoScan on Oct 15, 2011 said:

The piece is not a necessity however, it is a good idea. The idler pulley mounted on the end of a bolt supported only by the acrylic is not good engineering. There is too much flex. This piece supports the idler on both sides, no flex.

The MakerBot has plenty of room for improvement. That is either a good thing or a bad thing depending upon how you look at it.

MarkNowotarski on Oct 15, 2011 said:

Very nice!

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