Low Profile Adjustable Belt Tightener
by owen, published
Adjustable belt tension with a screw. Low profile, suitable for Ultimaker etc.
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Update: These won't fit on the 'Y' belts on newer UM's. See Notes and Picture in the comments below. Main picture here shows a clamp on the 'Y' belt of an older UM.
Parts required per belt
4 - M2.5 X 8mm small head screws. - http://www.ebay.com.au/itm/300521403792?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 1 - M2.5 X 30+mm screw. (35mm used here) - http://www.ebay.com.au/itm/370568422906?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 5 - M2.5 thin nuts - http://www.ebay.com.au/itm/120894813183?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
- Print 2 X Nut Side and 2 X Screw Side clamps for each belt (in there current orientation) and clean out with a 2.5 mm drill.
- Work out where the outside pair will clamp to the belt and move the spot to the centre.
- Twist the belt to assist in putting the clamp on.
- Push through the adjusting screw all the way through the bottom clamp.
- Place the other bottom clamp on the adjusting screw.
- Put the nut on the adjusting screw a few turns and slide the free clamp up against it.
- Clamp the top clamp onto the bottom clamp.
- Tighten the adjusting screw and twist the clamps so they are horizontal.
- Test tightness and adjust.
Over tightening makes it harder to move the extruder so test it still moves freely after tightening.