I cracked one of the clamps on mine, so I thought I'd design a stronger mount.
Designed to use M5 screws & nuts and fit 25mm pipe (US version as well now). It should accommodate steppers with longer shafts as well. The clamp is also deeper - I've made it this way as I'm using very smooth (chrome-like finish) 25mm Aluminium pipes, and felt it needed a better grip.
PS - do yourself a massive favour, and add these to your machine. Although I don't have my belts yet, the thing is SO much more rigid - even at 120mm x 900mm... http://www.thingiverse.com/thing:1096636
UPDATE - 25/01/2016 - don't print it yet - needs tweaking.
UPDATE 2 - 26/01/2016 - new version uploaded - corrected height - strengthened nut captures - printing it now to test.
UPDATE 3 - 26/01/2016 - printed and test fitted. Everything fits very well. Better grip on the pipes and much more rigid.
UPDATE 4 - 07/05/2016 - uploaded a US (23.45mm pipe) version
UPDATE 5 - 21/05/2017 - now available for the new model of the MPCNC... https://www.thingiverse.com/thing:2331589