Ball Pen Refill Holder for FABtotum

grabcad

This is a holder for a very common ball pen refill. With this small tool a 3D-printer becomes a pen-plotter. - The base plate (grey) fits in the tool holder of the FABtotum which is a 3D multi-purpose personal fabrication device but the principle can be adopted for other 3D-printer. - The lower pressure spring (red) is from a ball point pen, is about 17mm long and prevents the pen from falling through the holder. - The upper pressure spring (orange) is from an other ball point pen, about 30mm long. It has a bigger lead and in consequence a higher retention force. It allows the pen to retract. - The green clip is self centering with its cylinder. It can easily clipped on as shown or turned about 90 degrees. - The housing (yellow) is stucked through the bore in the plate and pressed down with the two clips (blue) on the plate.