26

Re: Adjustable Y Idlers - Reprise

mdrVB6 wrote:

Sorry, just seeing this now.  I modified these idlers to fit the stock holes on an SD4.  I'll post it from home later on but if I forget, shoot me a PM to remind me.  They work great.

Looking forward to see your tweak for the SD4 mount. I was going to do that plus modifying for smooth idlers but will wait to see your files. Thanks!

- Graber/Prusa I3 remix - Arduino Mega/Ramps 1.4 - Upgrades: Auto Bed Leveling, PEI bed, All Metal E3D V6, Filament detector
- Alted's MPCNC - 24" X 24" plate - Arduino Mega/Ramps 1.4 - DeWalt 660, TFT28 display
- Solidoodle 4 -  with Y axis Dual Motor Drive (own design), Lawsy carriage remix, chrome hardened smooth rods, bed stabilizer, GT2 belts
http://www.thingiverse.com/3dEz/about

27

Re: Adjustable Y Idlers - Reprise

I've just installed these corner blocks and they're absolutely amazing. The frame is much more rigid. I'm thinking of perhaps putting similar blocks in the remaining corners. What do you think? I had to shorten my belts about 1/2" I did not use the tightening method designed into your part since I don't have metric hardware. I like the idea of being able to tighten from the front.

Does anyone else have really wide bolts that the E3D extruder setup wants to bump into? There's no reason for them to be this long I think I'll cut off 1" so that I don't have clearance issues at the front (this is unrelated to this mod and was happening before too).

Also note to move the light strips before drilling wink

http://soliforum.com/i/?6MZxliG.jpg

http://soliforum.com/i/?DB2YMoG.jpg

Anyways, a million thanks! I feel like my SD2 is progressing towards being reliable.

pirvan wrote:

A short while ago, mdrVB6 was looking for some adjustable "Y" idler block replacement, and I came up with a set which he printed and apparently is quite happy with.

http://www.soliforum.com/misc.php?action=pun_attachment&item=7360

meanwhile someone posted a simple fix for a problem I never knew was there, but it's quite real: flex in the metal frame, where the blocks are mounted.  The tension in the belt is actually tweaking the frame

http://www.soliforum.com/post/78701/#p78701

The fix is simple enough, but I thought I'd give it a try with a different way to solve the problem that also combines the adjustable idler in the design

This new block replaces the stock idler block, and also requires 3 holes in the frame.  2 holes are to be drille, the other one, requires the removal of the pressed-in PEM nut.  The total adjustment offered device is 6mm. 

What makes this different than the original design, is that it fits in the corner of the frame, and provides the stiffness needed to prevent the aforementioned frame tweaking.  The slots on the top and side are there to accommodate the pop rivets the frame is put together with.

SD2 Pro + RH + Slic3r on Win7Ent (~Craigslist Oct. 2016 my 1st printer: upgrading & calibrating to near perfection)
- E3D V6 hotend; 30A PSU; Glass bed for ABS or Blue Tape on glass for PLA
- X-axis NEMA 14 press on fan (thing:1871741); Lawsy almost everything else; 3mm Z axis rod (thing:1868824)
- Sang board w/all headers, ATmega1284P w/OptiBoot and Marlin beta firmware; VRef tuned