Ultimaker Extruder Drive Upgrade
Description
Instructions
.par =Solid Edge
.stp
.igs
.stl
For detailed instructions see:
vinland.com/UM_Extruder_Bearing.html
The bearing can be found here for $7.41:
mcmaster.com/#standard-ball-and-roller-bearings/=i853dw
It is a Dynaroll SMR128ZZ A5
The spring OD is 7.72mm, has 8 turns of 1.14mm wire, and a free length of 20.9mm. Sorry, I do not have any part number since it came from my big junk box...
Since I needed to measure the spring used for the Ultimaker Upgrade I documented the steps both for a high accuracy measurement procedure and a simplified one.
vinland.com/Spring-Testing.html
Note, the spring for the upgrade is not critical. There is a tremendous adjustment range.
I added a section on Extruder Drive Force Measurements:
vinland.com/Extruder_Drive_Force.html
The long screw is 50mm.
The shaft screw needs to be 20mm since the yoke is 18mm.
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For those sourcing out a suitable spring, just want to share that I found one from an unlikely source -- a bicycle shop.
Bike derailers usually contain a spring or two with force and overall dimensions that's suitable for this extruder.
See pics below:
Source:
http://www.mytenspeeds.com/My_...
Direct link to derailer pic:
http://www.mytenspeeds.com/My_...
Compare to Ultimaker shop image:
https://shop.ultimaker.com/med...
The bearing is another story though as I'm still unable to get the best fit. I found a 12mm OD bearing but with a bore of 4mm, which is too thick to fit in the filament canal.
M3 50mm screws are hard to find! Where did you get yours?
Hi, What size is the ball bearing, i try to find it at mcmaster. but that site is a joke for searching, it has locked me out for 24hrs for searching: Dynaroll, SMR128ZZ, 128Z.
Id like the measurements in metric please :D
http://www.modelfixings.co.uk/... has lots of suitable bearings, 4mm width should be fine. I am waiting for a shipment of 2, one with 3mm ID, for a perfect fit for the M3 axle, and 8 or 10mm OD, and another 4mm wide bearing with 8 or 10MM ID and 14-16mm OD, basically a bearing in a bearing setup, since 2 standard bearings are still cheaper than one odd sized bearing. and it has a deeper reach to the bolt.
Thanks for listing the supplier.
You need at least 12mm OD bearing or the bearing will not reach the filament. Of course it is possible to grind away some material from the original plywood sides to make it work.
Similarly, a 4mm wide bearing will be a tight fit between the plywood sides. You might have to add a thin spacer between the plywood layers to slightly increase the spacing or grind away some material.
I did a lot of swearing last night trying to assemble this, and will be reprinting several parts I broke. The bit I missed in the instructions was "file off two sides of the 50mm screw head." :-)
I was trying to somehow assemble it with the full width of the screw head-- which emphatically does not work. That was after I realized it was the head and not the nut that fit into the slot in the delrin part. *headdesk*
Clearly I shouldn't start assembly at 10pm on a Saturday after a pleasant
dinner with a bit of wine.
Instead of filing the screw head down to size, you can also make a bit room in the plastic side panels with a knife or drill bit.
I am happy you got it resolved. Too little sleep will also create similar problems.
The good news is that soon you can print without worrying about fine adjusting the spring force because of changing filament diameter.
Very nice upgrade. I am getting more even extrusion and less problems with a filament plug just above the hot end brass tube. Note: If a different size bearing is used, you will need to adust the length of the yoke forks to account for the difference. I tried using a small diameter bearing without ajustin the yoke and the preformance was worse than with the original Delrin piece.
Great work, thanks. Printed one. I just added two spring caps because i use a different spring (shorter and wider) that looked ugly...
I've started to print this, but wonder how do you deal with the fact that the yoke is 18mm wide, whereas the default assembly is only 16mm? Because right now in the default assembly, my gear is almost touching the heads of the screws already.
the bushing seems a bit too thick. I had a better fit printing it 3.5mm instead
I wonder how you do 'tighten' the shaft screw, since there is only 2mm left for the nylock nut. Or did you use a longer screw for it?
I see the same on my extruder. I would have to add a washer to my large gear. Otherwise, the yoke screw will definitely interfere with the large gear. Maybe if I use a countersunk head screw on that side of the yoke it might just clear it.
The yoke is 1mm wider on each side than the plywood. The screw heads are 1.5mm so the gear must have more than that in clearance. To line up the big gear with the little gear I also have an extra washer on the big gear inside.
The Delrin part is 3.7mm and the bushing should be the same for a sliding fit. that assures that the 3.5mm bearing will not rub against the sides.
I used a longer screw for my final assembly.
If anyone has ordered all the parts somewhere, please share the information :)
I'm searching for the spring, the screw and shaft screw.. I don't have any junk boxes here to salvage those parts.
A list of parts that can be ordered online would help a lot.
(I didn't find the bearing from mcmaster site, but I found it by googling the name).
Here is another adress, where for example the german ones could buy the bearings. I
´ve ordered some today for 1,51â¬/piece.
Are you sure you're not overlooking the obvious - your local hardware store
;)
I have a combined "paint supplies and hardware" store in the tiny town I live in and they have all I could want of nuts and bolts. Anything else you can find easily on ebay (like the bearings)
The bearing is 12mm OD, 8mm ID 3.5mm Wide.
Search on McMaster page for: Metric, 12mm OD, 8mm ID
&
amp; 3.5 W.
The part # is 7804K115
some form of link to where to find springs might be helpful, the rest is trivial... maybe you could consider a design option to use (grooved) standard skate bearings (22x8x7mm)
I really like this upgrade. I need more information though. What size is the ball bearing? Where did you get it? What length is the long 3mm screw? How long is the screw on the yoke piece going through the bearing? How long is the spring uncompressed. Where did you get it? An idea of how stiff the spring is?
from what I remember, the force exerted by a spring is given by F=kX where k is the spring constant and x is the deflection. What that means is if you can find a spring that fits the diameter of the yoke, and is roughly the right length, you should be able to change the deflection until you get the right force. So if you're worrying about finding the right spring, don't - just find whatever you can, and experiment.
I'm going to print one of these over the next week, and will post back with my progress on finding a spring that works, and how it all turns out.
fnord.
I added the info in the instructions. I will update with the spring force data.
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I got my spring from a hole puncher.