Talk:RepRap Universal Mini Extruder
Jkeegan 18:32, 14 April 2011 (UTC) Hello! Adrian, what's the purpose of the hacksaw slot on the heater block? Is it just to compensate for expansion of the brass when it's heating up? Without threads, does the heater block hold on tightly? (I imagine it'd obviously depend on the size of the hole drilled, but in your prototype, is it easily slid out for maintenance, or tight?). On this page's discussion page I asked that too (sorry for repeating myself). On that page you mentioned you based your design on this one by Alain Mouette, and his pictures show what looks like a tightening bolt through the side with the slot. Just curious if you found the bolt unnecessary but the slot necessary, or just hadn't noticed the bolt, etc. Thanks!
For the sake of documentation, here's the response from Adrian on reprap-dev:
The slot is to allow for poor machining accuracy :-) You can drill the hole accurately, of course. But you then need to turn the nozzle to get a tight fit. If this ends up too tight, the slot allows a little give in the block. If it's too lose, you can compress the block plastically in a vice and the slot closes a bit; then it's tight...
Alain Mouette also commented:
I can say about my part of it: I like the slot because I use a screw to tighten the block on the nozzle, it makes it very convenient to remove it for mantainance or changing the nozzle. I understand that Adian's idea is just for the slot to allow for a little expansion as the block is press-fited on the nozzle.
- Jkeegan 20:27, 25 April 2011 (UTC)
It's strange to see "based on: unknown" and then in the text "I based this design (loosely) on Jstkatz's extruder on Thingiverse". I also can't find any mention of this on the thingiverse page you linked. (It would allow people visiting that page to even know that an improved version exists at all.) --MarcusWolschon 03:09, 11 May 2011 (UTC)
Another question: When you talk about supergluing the parts together, you say:
The triangular lip of the clip points away from the nuts you just fitted in the motor plate.
Call me daft but I think I misinterpreted that slightly ambiguous statement (and I'm afraid I've glued the piece on backwards). Before I pull it apart or print new pieces, I want to make sure I've got it wrong.. In the picture with the clamps (on the right), where you can see the embedded nuts - is the pointy part pointing "up" towards the camera or "down" towards the grey table? (Pointing to the other side of the plastic felt "away" when I read it too quickly before). - Jkeegan 01:51, 17 July 2013 (UTC)
Answering my own question - I can see how for sure that I had it wrong. Adding a clarification to the text. - Jkeegan 02:05, 17 July 2013 (UTC)