Velux Hook – Sloping Roof Window Handle by Zed42

Last crawled date: 2 years, 11 months ago

A robust “hook” handle to manage opening and closing of (Velux) sloping roof windows.
The hook is designed to fit an extension (telescopic, paint) pole (originally intended for paint roller) – both with and without the original soft plastic tip and also a round aluminum rod with 15 mm outer diameter.
The hook was designed with intention to absorb rather extensive forces (just in case the window does not move that freely) and is intended for handling opening/closing of the window only. I don’t have any auxiliary accessories like inner shades etc. hence these are ignored for the time being.
Model A – fits extension pole with the original soft plastic tip on. I.e. the pole goes without any modification except drill through the soft plastic tip in two spots to hold the handle in place. In fact another drill & screw tightening might be needed to keep the plastic tip in place since it is originally only glued atop of the pole however downward forces when opening the window may soon wear the glue out.
The extension pole itself is sold in hobby market(s) – German-headquartered Hornbach in my case – and the original soft plastic tip measures are: bottom diameter = 30 mm, top diameter = 23 mm, length = 120 mm.
Model A is round and appears rather bulky given the size of the soft plastic tip it’s got to swallow.
Model B – just like Model A also Model B fits an extension rod however this time without the original soft plastic tip, i.e. expects evenly round profile of 21 mm in diameter.
Model C – is designed to sit atop of 15 mm aluminum round rod. Since the rod is expected to be hollow a bottom Cap is provided alongside of this version.
Printing and usage: the hook handles look better when printed standing - however layers in that case have to resist the strongest forces as they are perpendicular to the direction of pull / push force. So I prefer to print them lying horizontally on printer bed.
I myself was printing in 0.3 mm resolution with 9 outline/perimeter shells with 60% infill. The positive effect of several outline/perimeter shells is in particular noticeable with Model C – which is the only model designed as squared on the outside so it prints well in horizontal position. Since this model is rather subtle (compared to A & B) the square outside shape looks & prints well lying on printer build platform. Outline/perimeter shells run alongside of entire shape uninterrupted thus giving good resistance to push/pull force of the print.
The rounded shapes of Model A and B need outer supports (definitely model A as it is also conic) when printing horizontally. When printing inside with supports (recommendable since the inner shape is round also for Model C) I manually removed a row of supports every 10 – 20 mm. In that way I could easily push them in to disengage before pulling them out and the support gaps were easily bridged. Only inside supports needed in case of model C.