Replacement knobs for Andersen window openers - Now with robust bolt option

When we purchased our home, we found that about half of the window winders, while functional, were missing their end-handles. These small, quick-printing parts serve as an easy functional and aesthetic replacement - not identical to the originals, but they do the job.

New version with embedded bolt

AndersenHandleKnob_WithBolt

This print embeds a nut in the printed handle, for what should be a fairly robust part. Note that I can't guarantee they won't come unscrewed!

You will need a #8, 1" bolt and a matching nut. Pause your print at the 14mm level to drop the nut in (attached GCODE & 3MF include this). Then pass the bolt through the back of the winder and screw the printed part on the front. You might need to first clear out bolt's track with a thin pair of tweezers or similar before it'll go in, depending on any internal stringing.

Original easy-print version

AndersenHandleKnob_Original

Not suitable for homes with small children or pets, as these parts do not firmly fasten (until I find a suitable solution).

This is a one-part model; the axle is split and printed in a splayed position, such that when squeezed to fit inside the tube of the handle, it will push open and hold in place by friction. No supports or brim are needed, but I increased to 4 perimeters such that the split axle is all perimeter, no infill, for maximum strength, and printed with a random seam as a linear one is too obvious.

These examples are printed in PolyTerra PLA Earth Brown, which has a good appearance and level of springiness. As printed the knob has a good friction fit inside and out, your clearance needs may vary.