Ultimaker Extruder Drive Upgrade
by Bertho, published
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I bought a pack of 150 hobby springs and none of them were strong enough. I happened to pass a motorcycle parts shop and wandered in on the off chance they would have something. He had a box of springs on the counter and I managed to find 3 candidates, one of which worked. As I was walking home I spotted a washer on the ground that worked for me too! All in all it was a good day. My prints are much more consistent now. Thank you!
I spent a few minutes looking on McMaster for the cheapest springs that would fit the bill. This is what I think will work: http://www.mcmaster.com/#cadin... - they are about $5 for 5, and can generate 7.5kg of force at full compression.
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.par =Solid Edge
For detailed instructions see:
The bearing can be found here for $7.41:
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.
Note, the spring for the upgrade is not critical. There is a tremendous adjustment range.
I added a section on Extruder Drive Force Measurements:
The long screw is 50mm.
The shaft screw needs to be 20mm since the yoke is 18mm.
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