Update 11-December-2023. Read the Disclaimer.
On this page I have collected my experience with the TwoTrees Sapphire Plus V1.1 3D printer. Bought in juli 2021 for 420 Euro. I found them now on the internet for 370 Euro. This printer has the Mks Robin nano V1.2 board with 5 TMC2225 drivers and has a dual Z-axis each with motor but coupled via a belt.
This page is not about how to assemble the Sapphire Plus. "Aurora Tech" and "Just Vlad" already have done that perfectly on Youtube. This page is about the problems I had and how I solved them.
The Sapphire Plus is not a 3D printer kit that requires a "one" hour of assembly and then prints perfectly ("out-of-the-box"). If you want that then better buy a Creality. Assuming you don't make any mistakes and this is not your first 3D printer an 4-8 hour build is do-able but don't be suprised if it takes up to 60 hours with all kinds of suprices. Just read this page. Careful and accurate assembly of each step is necessary. Then finally do some testing using the printer's menu (moving, homing, heating) to check that everything works.

Filedot: Mp4

The MP4 header (the ftyp box) is missing or the moov atom is at the end of the file (common with corrupted downloads).

Using FFmpeg:

In the sprawling digital ecosystem of 2025, video files are the undisputed kings of content. Among the myriad of file extensions we encounter daily – .avi , .mov , .wmv , .mkv – one acronym stands above the rest for its balance of quality and compression: MP4 (MPEG-4 Part 14). However, a newer, more specific query is gaining significant traction in tech forums and search engines: "filedot mp4." filedot mp4

ffmpeg -i input.mkv -c copy output.mp4 Note: This only works if the internal codecs are already MP4-compatible (H.264/AAC). The most common reason people look up "filedot mp4" is to solve the problem: "My MP4 is too large to email or upload." The MP4 header (the ftyp box) is missing

But what exactly is "filedot mp4"? Is it a new software? A proprietary codec? Or a specific tool? However, a newer, more specific query is gaining

TwoTrees 3D Printer Sapphire Plus V1.1 CoreXY issues

Filedot: Mp4