Right and Left Minimalistic Mk8 replacement - Modded
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Instructions
Update: Create one for the left side for those that have dual extruders and want to do both.
I was in my machine doing repairs for a thermocouple problem and noticed that my delrin plunger was worn. I did not really want to order parts and wait for them to come in to fix it so I modded the "Minimalistic Mk8 replacement" to fit what I had around the house.
I removed the spring and put a spot to use 3 "binder clip" arms to give the needed spring loaded pressure. I also adjusted the bearing area to allow for a 605 bearing (I had several in a bin full of RC helicopter parts), and made a printable pin that is a press fit through the arm and the bearing. I added a bit of a guide for the filament to make it easier to guide it in when loading.
Printed at 0 extra shells, .2mm layers and 100 infill. After it printed I cut the support away from the bearing area, installed the bearing and then put a drop of superglue on each side of the pin to make sure it didn't move after I installed it.
Have made a few test prints so far and it seems to be working quite well.
I only did the right side because I rarely print with my left extruder.
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Any Chance you can do me a modified Left version, I have a 628 (8x24x8) bearing I was just about to make a similar extruder but as you appear to be a few hours ahead you could save me the ear ache from the miss's :).
Its only a single extruder from a Rapidbot so I think its the same size stepper motor having a quick look
How to you fit this together? Does it require additional hardware parts or is everything printed?
This is awesome! Thank you so much. My replicator is working like a dream again. Don't have to watch it like a hawk waiting for a jam.
as luck would have it.. I was looking at these mods for the exact same reason .. started printing with PLA and BAM.. no more ABS for me at the mo.. this printed out amazing .. I had the exact bearing from a Dremel teardown and it all snapped together flawlessly. Doogiekr, you are a champion.. I had the Bull clips handy and was able to make this without spending a cent!! well done on a great idea!!
you need to post the .scad or whatever you used so that we can change the bearing parameters
Where's the file for the plastic pin hinge you used to put the two pieces together? Thanks.
Very clever! The binder clips look like they're probably more secure in position than the springs (which, at least for me, don't feel securely in place), and are certainly easier to source. It's odd that while bolts and nuts are standardized, springs appear to be randomly designed by each manufacturer. And binder clips, while not technically standardized, are easy to pick up for almost nothing at any office supply store. Yay!
And adding a 'guide' for the filament is great. The only problem that I have with the minimal extruder is that it's a little fiddly feeding new filament in, and this might help.
Huge thumbs-up, you made a good thing even gooder! :-)
Yeah, the binder clips are very secure... there is no way they are coming out of the arm without alot of help from the user. I never made the original one, so not sure how much different mine will be, but I read somewhere on the makerbot operators group that a little more filament guide would be nice so I went ahead and added it while I was doing the other changes. I rounded a few corners and changed some spots that looked they could benefit from being stronger as well.
was asked what size binder clips i used, not exactly sure so I just took some pictures with a cm/mm scale for ref
love the binder clip idea. Got me thinking about using the clip part somehow...
Very nice and practical improvement! This should encourage people to try it with easily sourced parts.
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I've been hitting my head against the wall for a few weeks trying to get my once working Replicator to print a piece I need; most of this time was spent adjusting the plunger!
Luckily, I was able to print a decent copy of this Thing and it's printing a lot better (but not perfect yet).
I didn't have any bearings handy but I did have quite a few brass screws and nylon washers. I managed to make the hole for the screw large enough by carving at it with larger and larger hex keys and tapped it for a 8-32 screw. I used a hex set-screw instead of a normal screw as the latter stuck out and made contact with the heat sink of the print head, preventing its reassembly. I used two nylon washers (sized "large enough") in place of the bearing and it seems to work okay!
Thanks so much!
Glad its working out for you... If you need it to be different, let me know and I will see what I can do.