● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
Read Article →| Bulk Pricing | ||
|---|---|---|
| QTY | Unit Price(Inlc. GST) | |
| 25+ | ₹58.41 ₹ 49.5 + 8.91 GST | |
| 50+ | ₹57.82 ₹ 49 + 8.82 GST | |
| 75+ | ₹56.05 ₹ 47.5 + 8.55 GST | |
| 100+ | ₹55.46 ₹ 47 + 8.46 GST | |
Durable carbon steel hidden corner joint for 2020 series profiles. Perfect for high-strength, aesthetic joints in 3D printers and CNC frames.
When building a high-end 3D printer or a laboratory-grade enclosure, bulky external brackets can ruin the clean lines of your frame. The 2020 Series Interior L-Joint Corner Connector is designed to sit entirely inside the T-slot groove, providing a high-strength connection while remaining invisible from the outside.
Our interior brackets are Probots™ ProSpec Grade, manufactured from hardened carbon steel with a high-quality zinc coating for superior rust resistance. Unlike cheap cast versions that can crack under tension, these are Probots™ Lab Verified to ensure the M4 threading is clean and the grub screws provide a "bite" that won't vibrate loose during high-speed 3D printing.
Profile Compatibility: Standard 2020 Series (6mm T-Slot).
Material: Zinc-Plated Carbon Steel (High Durability).
Connector Type: Hidden / Interior L-Shape.
Fasteners Included: 2x M4*6 Grub Screws per bracket.
Slot Fit: 6mm (Standard European/Indian Profile Slot).
Dimensions: Approx. 25mm x 25mm x 10mm.
3D Printer Frames: Perfect for Voron, Ender, or custom CoreXY builds where panels must sit flush against the frame.
Enclosures: Create clean acrylic or glass housings without bracket interference.
Camera Rigs: Lightweight, strong joints for modular aluminium camera sliders and cages.
Sim-Racing Cockpits: Use as internal reinforcement for secondary supports.
Past Projects (Prerequisites): If you've been using external cast brackets, you know they can block your "Panel-Mount" dreams.
Feature Upgrade: This connector unlocks Flush-Surface mounting. You can now mount electronics or panels directly to any face of the profile without a bracket in the way.
Effort/Requirements: Beginner-friendly. Requires a 2mm Allen key for the M4 grub screws.
Safety Tip: Do not over-torque the grub screws; once the joint is rigid, a quarter-turn is sufficient.
Installation Step 1: Slide the L-bracket into the end of one profile.
Installation Step 2: Slide the second profile onto the other arm of the bracket.
Installation Step 3: Use a 2mm Allen key to tighten the grub screws through the profile slot.
Included: 1x L-Shape Interior Bracket, 2x M4*6 Grub Screws.
Required Additional: 2mm Allen Key, 2020 Aluminium Profile.
Will this fit 2040 profiles? Yes, it fits the 20mm T-slot side of 2040 profiles.
What size Allen key do I need? A standard 2mm Hex/Allen key.
Is this stronger than an external bracket? It is structurally very strong, but for heavy-load gantries, we recommend using both internal and external supports.
Does it come with screws? Yes, each bracket includes two M4*6 grub screws.
Can I use this for 3030 profiles? No, this is specifically for 20 series (6mm slot).
Is it rust-resistant? Yes, it has a zinc-plated finish for corrosion resistance.
What is the material? Hardened carbon steel.
Can these be used for V-slot profiles? Yes, they are compatible with both T-slot and V-slot 2020 profiles.
Do I need to tap the profile holes? No tapping is required; the bracket slides into the groove.
Can I use longer screws? M4*6 is the standard; longer screws might stick out of the slot.
How many do I need for a cube? You typically need 8 connectors for a basic cube frame.
Are these sold individually? Yes, priced per unit for maximum flexibility.
Will these work with black anodised profiles? Yes, they fit all standard 2020 finishes.
How much weight can a single joint hold? When properly tightened, it supports standard 3D printer frame stresses easily.
Can I use these for 1515 profiles? No, 1515 uses a much smaller slot.
Are they visible after assembly? No, they are completely hidden inside the profile.
Is it easy to disassemble? Yes, just loosen the grub screws and slide the profile off.
Can I use these for moving gantries? Yes, but ensure the grub screws are tightened firmly to resist vibration.
What is the thread pitch? Standard M4 metric thread.
Does Probots offer bulk discounts? Please contact our sales team for institutional or bulk requirements.




Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
For order related queries contact -
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
Need Help?
For bulk enquiries contact us by -
Probots Electronics is highly regarded for its great selection of components and professional service. Customers frequently praise the awesome care and timely delivery provided by the team to ensure all products arrive safely.
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