add GL45 holder for dovetail platform

[gniezen]

No description provided.

[Aqueum]

Sorry, took me a while, but now I've actually read the scad, I get it. Your scad, takes the stl with the dodgy corner markings and covers them. My only concern is that others may also not get this and print the one with the dodgy corner markings. Is there a way we can make this less likely, and more likely that they print your nice smooth, and much more sterilisable version?

[gniezen]

Yes, we keep the source in the github repo, and we link to the files we want folks to use from our documentation - whether that is a markdown file in the repo or a website.

[Aqueum]

Suggested change

	import("duran_holder_platform_center_0.25L.stl");
	// GL45BottleHolder – Pioreactor dovetail GL45 bottle holder
	//
	// The upstream Duran holders (e.g. Printables 1058356) have lettering
	// cut into the four corners. Those recessed letter shapes trap residue
	// and are awkward to clean. This SCAD fills them with smooth pillars
	// while leaving the rest of the geometry untouched. The 0.25 L version
	// renders to GL45_holder_250ml.stl – that's the file to print.
	import("duran_holder_platform_center_0.25L.stl");

[Aqueum]

O4.7:

Alongside the inline suggestion above:

1. Move duran_holder_platform_center_0.25L.stl into a source/ subfolder so the print target stands out. The SCAD's import(...) path needs to update to match (the inline suggestion above preserves the old path, so worth applying both together).

2. Add a Components/GL45BottleHolder/README.md:

# GL45 Bottle Holder

Pioreactor dovetail platform holder for a 250 ml GL45 Duran bottle.

## What to print

`GL45_holder_250ml.stl`

## What this fixes

The upstream Duran holders (e.g. [Printables 1058356](https://www.printables.com/model/1058356-duran-bottle-holding-platform-for-pioreactor-platf/files)) have lettering cut into the four corners. The recessed letter shapes trap residue and resist cleaning. This component renders the same geometry but with the four corner cutouts filled by smooth pillars. Bottle size remains obvious from the filename and from whether a 250 ml bottle visibly fits.

## Files

- [`GL45_holder.scad`](GL45_holder.scad) – source recipe
- [`GL45_holder_250ml.stl`](GL45_holder_250ml.stl) – **print this**
- `source/duran_holder_platform_center_0.25L.stl` – upstream Duran holder, kept in-repo so the SCAD renders offline. Not for printing.