Tools
Tools from my own workshop.
What I build for myself, you can use too: add-ons for Blender, free tools for websites and games to join in.
- Free
Apps
Crown&Paste
An iPhone keyboard that remembers everything you copy and pastes it back in order.
Pasted entries are ticked off, not deleted, and entries sit in stacks sorted by project. No server, no account, no tracking. In testing now, coming soon to the App Store.
- 39 euro
Blender add-ons
Crown Works
Everything: enclosures, surfaces, G-code, shape cutting, wall mounts, keyboard cases.
Born from building an NFC reader: housings, fits and mounts become sliders in Blender and stay editable. Print the tolerance coupon once, and every tool works with your printer’s real measurements.
- 19 euro
Blender add-ons
Crown Surface
Patterns and logos on any face, vents and hole patterns through any wall.
Five patterns, your logo as an SVG and cut-throughs like vents or honeycomb, even on curved walls. If you change the shape, one button reads the outline again.
- 19 euro
Blender add-ons
Crown G-Code
Spiral toolpaths straight out of Blender for vases and lamps, no slicer.
The path is written in Blender as one continuous spiral, with no seam and no stops. Ribs, twist and ripples are computed as the path, not as geometry.
- Free
Blender add-ons
Crown Works free
The free edition to try: basic shapes, holes, inserts. No key, straight as a zip.
Threaded inserts, nut pockets, screw holes, fits, snap fit clips and the tolerance coupon, with no account and no limit. Only the generators are paid.
- Free
For websites
Keks-Banner
A cookie banner with a jump’n’run and your logos in the city. One file, proper consent.
Nothing is preselected, “Allow all” and “Only necessary” are the same size, and scripts only run after consent. The file sits on your server and sends nothing anywhere.
- Free
For websites
Website check
A quick check in seconds, plus deep and SEO checks with a report by email (German).
It checks load time, title and description, the mobile view, preview image, legal notice and privacy policy. Each point says why it matters.
- Free
For websites
Shop rules
Every new obligation for online shops as a checklist: tick off, filter, get reminded before deadlines.
Every chapter with deadline and sources, from the withdrawal button to e-invoicing. After a few yes/no questions in the rules finder, only what applies to you is left.
- Free
For websites
Shop rules check
Enter your shop address and see in a minute which obligations are missing. No sign-up.
The check reads your home page, a product page and the legal notice and looks for the guarantee notice, the withdrawal button, product safety and more. Neither address nor result is stored.
- Free
For websites
Ad copy checker
Check product texts for banned green claims, with better wording. Stays in your browser.
Since 27 September 2026 some green claims are banned and others need proof right next to them. The checker also reads your product export from Shopify or WooCommerce.
- Free
Games
Live Arena
Search, count and find-the-person games live on TikTok: answer in the chat or play on your phone.
The stream shows a QR code that turns your phone into a controller. Type a name and play along, no account.
- Free
Games
Weekly Sudoku
A new puzzle every Monday, with a leaderboard. No account.
Everyone plays the same puzzle, so the leaderboard is a real comparison. The clock only runs while you play.
Which one do I need?
01
You build enclosures, mounts and technical parts.
Then Crown Works. Fits, inserts, enclosures, shape cutting and mounts are in it, and the surfaces and spiral toolpaths of the two single tools come with it. 39 euro once: one euro more than the two single tools, and you get fits, enclosures, shape cutting and mounts on top.
02
You only want patterns, logos and vents.
Then Crown Surface at 19 euro. A relief on the face you point at, and the cut through that same wall. No enclosure generator, no g-code.
03
You print vases, lamps and bowls.
Then Crown G-Code at 19 euro. One continuous spiral straight out of Blender, with ribs, waves and twist. No slicer in between.
Questions that come up
Which Blender versions are supported?
Tested on 4.5 LTS and 5.2 LTS. Every release runs a headless suite on both versions: sixteen stages that build the geometry, measure it and compare the numbers against the expected values. What fails is not shipped.
What does the free version cost?
Nothing, and it is not crippled. Heat set inserts, nut pockets, screw holes, feet, spacers, fits, snap fit clips and the tolerance coupon, with no key and no account. What costs money are the generators.
Why do I need this tolerance coupon?
Because printed holes come out smaller than they were drawn, and by a different amount on every printer. The coupon has five rings from 0.1 to 0.5 mm of clearance and a test pin. You print it once, enter the value, and from then on every tool works from your machine.
How many machines can I use it on?
Yours. The key counts how many machines it has been activated on, once per machine and not on every start. After activation it keeps running for 14 days without an internet connection.
Can I sell what I make with it?
Yes. What you design and print is yours, without limits and without a cut for me. The add-on itself is under the GPL, like every Blender add-on.
How do updates reach me?
There is a button in the panel. It checks your key and swaps the files. Updates are included in the price, there is no subscription.