EIBOS Cyclopes Extension Walls and Bearing Risers

The EIBOS Cyclopes is about as good a filament dryer as you can get these days, but it has a major flaw - the filament rolls are too close to the heat source and they will scorch.  Some, including myself, have attempted to solve this problem with a heat deflector plate.  That works somewhat but it seems to cause back pressure and overheating of the sides and bottom of the unit  

I have a better solution.  I created extender walls and a center riser which elevate the spool holders and bearings while still preserving the original parts and functionality.  Measurements with a temp probe show the temperature under the filament spools is close to what it should be.

To give credit where credit is due, I found a set of excellently designed extension walls created by MMartinJ on Thingiverse:  https://www.thingiverse.com/thing:4962034.  Using his dimensions and overall shape as a template, I created new walls with bearing holders and locator features, and I also created a center bearing riser.

Print Settings

I used PETG and it's holding up fine.  You should use ABS, ASA, or nylon if you consistently run the dryer above 60 degrees C.

Walls:  PETG, 30% infill, 0.2mm layer height, no supports.  I used the auto variable layer height to get a smoother radius on the bearing holders.  It is possible to print both walls on the bed.  See photos.

Center bearing riser:  PETG, 30% infill, 0.1mm layer height - important or it will not fit properly.  Print flat side down either side.  Use ‘supports everywhere’ setting.  The supports are  small and minimal and they will ensure crisp flats which are critical to get proper fit.  See photos.

Assembly Tips

Visually check all parts for clean bearing slots by popping one of your bearings in and out a few times.  Should be a light press fit, no slop, but not too tight either.  If too tight, check for supports flash leftovers and cut or file those away.  Make sure you are pressing the bearing in squarely and press the bearing in a few more times and the fit should loosen.  Also check the bottom flats of the center bearing riser, they should be clean.

The walls were designed to locate using feet and should have little to no slop.  They should sit flat on the bottom and the side joints should be even.  If they don't, a few light strokes with a file or sandpaper on the angled sides of each locator foot will provide a little more clearance.  Maintain the angle of the feet!

I found that the temperature is most accurately maintained by raising the temp sensor a little bit.  Just pull it out and bend it back a little as shown in the photos.