Roof Window Handle Extension

Roof Window Handle Extension – 3D Print Idea


If someone asks me what is the most used object that I have ever 3D printed, I would answer that it is a roof window handle extension – a customized tool that helps me and my family to open and close windows in a bathroom and bedroom that are too high to reach. Luckily, our roof windows are not very high and I was able to 3D print this tool on a Plus-size 3D printer. In this article, I will go into detail describing the life-improving idea and what’s involved when designing, slicing, and printing such a heavily used, 3D printed at home, object.


This Guide Covers

Disclaimer. The object described in this article is only an idea with an example STL file. The design is in testing and we won’t bear any responsibility for any accidental damage to the property if such occurs.

Disclaimer. Before printing this item, make sure the measurements match your specific window handle.

Telescopic Poles and Adapters

There are an official pole and adapters available for a particular window type usually found in lofts or attics. These would work in most cases, especially with the higher-positioned windows. But, when a roof window is used daily, our custom handle extension solution may be worth looking at. As a bonus, there is no need for a long pole that takes extra space to keep.

Before going further, there is one thing that is important to mention in any case. Maintain your windows by applying some lubricant solution to the hinges once in a while.

Designed in Blender

Once I started exploring Blender, I prefer to stay on it as it is a sandbox and has it all. As usual, it all started with the cube which got expanded, sides and faces extruded into a lever-looking object. The top part was measured to fit the original window handle and the rest of the object was stretched to fit the Snapmaker A350T build platform diagonally. The final object is 380mm (15 inches) long.

Handle in Blender
Handle in Blender

The Subdivision Surface modifier helped to smooth the sharp corners of the handle, while the Edge Crease option made sure the base of the object was flat and printable.

I think it is possible to make this object a bit fancier by adding a curve, for example, or applying some texture. As this object is still in the testing phase I left it as it is.


Material of Choice

For the testing purposes, I used the material I had. And below are the results. Please mind that we open our windows a few times per day.

Material – PLA Plus. Environment – bathroom. I knew from the beginning that PLA will struggle to last long in a room with high humidity levels. So, the toughest I had was reinforced Black PLA Plus by SUNLU. This filament produces strings, requires higher temperatures, and has poor bed adhesion. Generally, the qualities are similar to PETG. Result – still works after 10 months.

Material – Wood PLA. Environment – bedroom. For the 2nd window, I printed the handle extension in Fillamentum Timberfill Light Wood. This is an awesome material that resembles real wood, read my detailed filament review here. In terms of durability, it is a risky choice. But as the 2nd window is situated in a dry room and we open it less often, I gave it a try. Result – all OK after one month.

3D Printed in Wood Handle Extension
Handle Extension 3D Printed in Wood
©3DWithUs – Print & Photo: Max Funkner

Recommended materials. When using such fancy filaments as Timberfill, for example, it may seem expensive, as each print takes approximately 200-250g of the material. My durability testing still goes on so I cannot vouch for any kind of PLA, just yet.
My next choice for the bathroom will be either fancy-looking PETG or filaments reinforced with Carbon Fibre. The reinforced strong filament is usually sold in black color which doesn’t go with our décor, unfortunately.

How to Print – Slicer Settings

FDM 3D printing has some weaknesses that should be addressed when slicing an object that will have to resist certain forces. Our extension handle should be printed horizontally only with many perimeter shells.

Cura Slicer Preview
Cura Slicer Preview – 9 Wall Lines

Excessive perimeter shells (wall line count) and high percentage infill add to the object weight and printing time. When I was tuning the slicing settings, I focused on the area where M3 40mm screw and M3n locking nut will sit. To make sure the plastic will be consistent there to melt properly and withstand certain forces.


3D Printer of Choice

As I mentioned before, the roof window extension handle was scaled to fit the print bed. Initially, it was the Snapmaker A350T 3D printer that the object had to fit. Snapmaker with the enclosed chamber can be good for printing such items in materials like ABS or Carbon Fibre-type filaments, for example. The controlled environment in the enclosed chamber helps against warping.

The second printer of choice was Elegoo Neptune 3 Plus. Luckily, the same STL, without scaling a model, fit the print bed diagonally.

3D Print on a Snapmaker Bed
Roof Window Handle Extension 3D Printed on Snapmaker A350T
©3DWithUs – Print & Photo: Max Funkner

On large print beds like on Elegoo Neptune 3 Max (420 x 420 x 500mm), Anycubic Kobra Max (400 x 400 x 450mm) such a tool could be made even longer, approximately up to 500mm (19.6 inches) long.

There are 3D printers that are initially designed to print objects that are long but low. Such printers are highly likely to be custom-built, rare, and therefore be much more expensive than the sub-$500 3D printers I featured above. Belt 3D printers are suitable for printing such objects, but the resulting print will be very weak and might break quickly. The fusion between the layers will be much weaker compared to that when printing horizontally with the continuous flow.

3D Printing 520mm (20.5 inches) Handle with Elegoo Neptune 4 Max

My roof window handle, 3D printed on the Elegoo Neptune 4 Max, came out to be 520mm (20.5 inches) long, which is 140mm longer than what I printed on the Neptune 3 Plus. This time, to reduce the weight of the object, I printed it partially hollow. Check my hollow settings here. Let’s see if there will be any issues. Still testing…

Handle Extension Printed on Neptune 4 Max
Handle Extension Printed on Neptune 4 Max
©3DWithUs – Photo: Max Funkner
Handle Extension in Action
Handle Extension in Action

Just a quick note, for my continuous testing, this object is printed in PLA, but I would recommend printing such heavy-use objects in PETG or other stronger materials instead.


Roof Window Handle Extension Assembly

== DO NOT OVERTIGHT ==
The assembly is straightforward. I would recommend putting the nut in place before attaching the extension to the handle as it will be trickier to do afterward.

Custom Handle Assembly Set
Custom Handle Assembly Set

These are spare M3 bolts and nuts from my previous Prusa MK2 3D printer. Amazon’s equivalent: of the bolts and nuts.

The roof window handle extension in action
©3DWithUs – Print & MP4: Max Funkner

Conclusion and Files

This is an object that I use on a daily basis. I am very proud of this model and the idea, and that I had a chance to bring my design and 3D printing skills to something useful at home. In the comments below, please let me know if there is a possibility to improve such a model.

Files on Cults and Printables.

According to our 3D print cost calculator, this 3D print job costs $20.57 if printed in Timberfill and $8.90 in other inexpensive and less fancy materials.

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Sharing or selling my digital files is not permitted. These remain my intellectual property. To obtain permission to sell physical prints of any of my designs, please subscribe to the commercial tier on Ko-Fi.

Read more: Functional 3D Printing at Home – Useful 3D Prints

Functional 3D printing does not get the same publicity as printing for fun. The share of useful 3D prints in domestic 3D printing is growing but such models are not appreciated enough. In our opinion, both types of modeling are needed and it all goes in the right direction. Here is the list of ideas for practical 3D printing at home.


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