Here's a video of a delta that someone has built using an extruder on a 4th tower, enabled by the recent addition of support for more than 3 towers in RepRapFirmware. Notice how the height of the extruder adapts not only to the Z height of the extruder but also to the XY position.

[www.youtube.com]

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Hmm. Solving a couple of issues with Delta machines.

Hmmm,
DLC

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Kits: Folgertech Kossel 2020 upgraded E3Dv6, Tevo Tarantula enhanced parts and dual-head, TronXY X5SA Pro(E3DHemera).
Scratch: Maker-Beam XL Micro Delta, 220x220CoreXY.
Actually bought: Bambu Labs X1 Carbon

There is no new idea in the world!

I thought shoter Bowden tube removes many problems caused by excessive bending of the tube during printing.

I added the fourth axis to install the extruder on my Fisher last year.
- Two smooth rods
- Counter weight
- Extra printed parts
- Two pulleys
- Two cylinderical bearings

I haven't finished it though.