GTK-Prototype UG was founded in 2014 by Tobias Günther and initially dealt with rapid prototyping machines.

Over the years, CNC milling and turning as well as assembly and development work were added due to customer requirements.

GTK-Prototype develops and designs on behalf of customers as well as internally using the most modern CAD systems such as Solid Works, Autodesk Inventor, Fusion 360 and others and inserts them into a comprehensive CAM system.
Through the production of prototypes in medical technology, mechanical engineering and the automotive sector, GTK-Prototype was able to acquire extensive experience in manufacturing.

In 2018, the production option laser cutting was added.

GTK-Prototype is currently based in Neuhausen near Tuttlingen and will move to the newly built company location in Radolfzell in the course of 2022.

GWL is a medium-sized 3D printing service provider that, in addition to the industrial production of prototypes or series, also takes on the development or 3D printing optimization of your projects.

The H & H GmbH offers in its two business units H & H H & H innovation and smart products all the services needed an idea on the way to series production. We develop, build prototypes and simulate, test and then produce the shape idea made in production quantities. A particular strength of the H & H GmbH is the production of products, such as technically sophisticated plastic parts that are needed in small quantities. Our customers come from the industries such as automotive industry and suppliers, medical, bathroom and toilet facilities.

In all stages of the process H & H is exclusively committed to the customer. We provide our expertise available to ensure that your product idea to market success. During the development, we have the later manufacturing processes in mind. We design manufacture and assembly meet and focus when needed at our manufacturing facilities. So we minimize during development cost and achieve the highest quality standards in the later series production.

In recent years, then came the expansion of the plastic molding and an extension of the value spectrum for surface finishing as well as parts and assembly - Since 2009 we provide service & maintenance of photovoltaic-scale plants at

H & H is divided into two business areas:

H & H Innovation:
Is your partner in the product development process

Development: CAD CATIA V4/V5 - NX - Simulations / FE calculations - patent search - assistance in patenting / intellectual property rights management

Prototype: STL / SLS - Vacuum casting - RIM - milling models 3-axis and 5-axis

Testing: wind tunnel - Climatic tests - measurements - stress tests

Pre-series: Teaching and fixtures - Prototype tools and parts - plastic and metal parts - assemblies of assemblies, components and systems

H & H Smart Products
Is your partner for assemblies, components and systems for complex, technical

IN- Studio is a company in the province of Turin specialized in planning, 3D prototyping and design capable of developing your project in every part, from the initial idea, to the three-dimensional model, to the construction tables, to the manuals, from the renderings of presentation to 3D printing of the product.



We were born with the aim of realizing ideas by exploiting new technologies and creating low-cost objects and prototypes with exclusive designs that cannot be realized with other methods.

We work throughout the country and abroad, delivering short manu the model made within 30 km from our office without additional costs; alternatively, we will agree on the shipping method based on your needs.

We will be happy to make an appointment for your company to present our services in person.

A Ukrainian additive manufacturing provider and an OEM of LPBF equipment relocated to Poland. End-to-end capabilities from DfAM, topology optimisation, CAD, Metal 3D printing (5 machines), DLP printing, FDM and post-processing with CNC.