Door Handle (Square with Rose) for Internal doors

A square design handle for internal doors with a round rose, for screw mount. The design fits an 8mm spindle to turn a latch. It supports standard door springs of 30mm diameter, which you can buy online, although a sprung latch may give enough force to return the handle.

The 2-piece Rose design is easier to print, does not need supports, but leaves the screws exposed and visible when fitted.

The 3-piece Rose design needs supports, and fully covers the screws when fitted.

Measurements:
The 2-piece rose is 60mm diameter and 10mm thick
The 3-piece rose is 58mm diameter and 10mm thick
Distances between the screw hole centres are 34mm vertically and horizontally.
The handle is 120mm long and protrudes from the rose by 50mm.
The cavity for the 8mm square spindle is about 38mm deep.

Assembly:

1. Place two halves of a rose over the base of the door handle spindle such that the indent in the rose matches the spindle and the outer faces are correctly orientated. Click the two halves together - this might need a hard press. Printed in PETG, mine were quite hard to click together but hold firm.

2. Decide which direction you need to turn the handle and install a spring by pressing it into the centre. The spring should twist to reduce in size when you operate the handle. Flip it over if it's wrong. There's NO limit to moving the handle in the wrong direction but this should be avoided.

3. Slide each handle onto the door's axle and check orientation and spring operation. Now screw into place on the door.

4. If you've used the 3-piece Rose design, now slide the cover plate over the door handle and onto the rose. There's two indents on the rose onto which the cover slides into and then rotates clockwise to hold it in place.

Other Parts Required:
You will need four 4mm diameter countersunk screws to mount each handle, of thread about 8mm plus the depth you want to penetrate the door. The screws should mount flush into the rose with a head no more than 7mm diameter to avoid scraping knuckles.
You will need two 30mm door springs per door. See the photos for the type I'm using.
You will need the 8mm spindle. I've supplied an example one of 100mm length for determining what you need - scale this as required. You could probably use this but I'm not sure how long it would last!

Printing:
The handles can be printed without supports when oriented as supplied, with the outer face on the build plate. I've used a textured print surface (unitak3d) which hides print lines. I printed in PETG with 4 walls and 15% gyroid infill and 0.2mm layer height. 

If you print the 2-piece Rose design, this can also be printed without supports.
This uses about 83g of filament for 4 rose pieces and 2 handles.

If you print the 3-piece Rose design, the two halves need supports but the cover plate does not.
This uses about 87g of filament for 4 rose pieces, 2 rose covers and 2 handles.

I've included a "Handle Stump" model that's the handle mechanism with no handle. If you want to remix and have a go creating your own handles, you can build off this and remember it needs an 8mmx8mm hole in your extension.