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Replacement Knobs, Feet and Fittings for Test Equipment

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I purchased a TDK Lambda GENH series power supply from eBay. One of the two knobs was missing. They are simply pushed on and there is no real retention mechanism.

I used Fusion 360 to create a model of replacement. I printed the replacement in white PLA.
I reduced the number of bumps on the outside to get a better print.




Edit: Here is a picture showing an original and the 3D printed part:


The same knob is used on Lambda GEN  and ZUP series power supplies.

I have attached the files.


I got a Rohde&Schwarz BOL (rebranded National VP-5512A) with a broken rear foot. So I designed a replacement to be printed.

This is somehow simplified to the original molded one. The scad file is ugly hacked together without parameters.

It can be printed without supports by laying it flat on the bed on the slanted side.
Just add an adhesive rubber bumper if you want.

The second one tries to imitate the original corrugated design. I haven't printed it yet.

Can be found at Thingiverse:

Does anyone know where I can find a replacement frequency knob for my HP 339A Distortion Measurement Set? Can some one here make one for me? I temporarily installed an old hp knob but have to count the turns since it does not have a numbered 1-10 skirt. Thanks in advance!

Here is a fairly often broken part that isn't available anymore.  The cooling fan impeller for a Tektronix 2465 Oscilloscope and its matching collet.

The fan can be printed bottom down without support.  The collet should be printed thin side down with a raft for adhesion.  Density isn't too important for the impeller, but the collet should be printed at high density.

The collet needs a stud in the end, with matching nut.  You can use SAE or Metric as is your preference.  Printing the collet at high density allows for drilling and tapping to match your choice, though it should be possible to melt it in with care to get it straight.

The original part uses a metal reinforcing ring at the top of the shaft.  That ring could be salvaged from a broken part, but many won't have that part or the ability to fabricate the ring so this design settles for adding more plastic in this area.  Would greatly complicate the mold if that were how this part was going to be made, but not an issue for 3D printing.   This will probably fail after a decade or two of use, but that is just time to print another.

The picture shows that I don't go for perfect finish on my functional parts, but it works fine and is completely hidden under the back cover of the scope.

Those who can't or don't want to print their own can message me and we'll work something out.


I don't have a 2465 but I'm printing one of these anyway because it is so cool  :clap:


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